the following links direct to:

### curves

- right strophoid
- cardioid

### conics

- tangents to a circle, from an exterior point
- tangents common to two equal circles
- tangents common to two different circles
- interior tangents common to two different circles
- ellipse, given its axes #01
- ellipse, given its axes #02
- tangent and normal to the ellipse
- foci of a given ellipse
- tangents to an ellipse, from an exterior point
- tangent to an ellipse, given its direction